Home
Class 11
PHYSICS
A pendulum of length 2 m lift at P . Whe...

A pendulum of length 2 m lift at P . When it reaches Q , it losses 10% of its total energy due to air resistance. The velocity at Q is

A

6 m/s

B

1 m/s

C

2 m/s

D

8 m/s

Text Solution

Verified by Experts

The correct Answer is:
A
`(1)/(2)mv^(2)=(0.9)mgh`
`implies v^(2)=2xx0.9xx10xx2=36`
`implies v=6m//s`.
Promotional Banner

Topper's Solved these Questions

  • SIMPLE HARMONIC MOTION

    ERRORLESS|Exercise NCERT BASED QUESTIONS (Spring Pendulum)|30 Videos

  • SIMPLE HARMONIC MOTION

    ERRORLESS|Exercise NCERT BASED QUESTIONS (Superposition of S.H.M.s and Resonance)|7 Videos

  • SIMPLE HARMONIC MOTION

    ERRORLESS|Exercise NCERT BASED QUESTIONS (Time Period and Frequency)|7 Videos

  • ROTATIONAL MOTION

    ERRORLESS|Exercise Assertion & Reason|25 Videos

  • SURFACE TENSION

    ERRORLESS|Exercise ASSERTION & REASON|11 Videos

Similar Questions

Explore conceptually related problems

The bob of a pendulum was released from a horizontal position. The length of the pendulum is 10m. If it dissipates 10% of its initial energy against air resistance, the speed with which the bob arrives at the lowest point is : [Use, g : 10 ms^(–2) ]

The bob of a pendulum is released from a horizontal position. If the length of pendulum is 2 m, what is the speed with which the bob arrives at the lower most point. Assume that 10% of its energy is dissipated against air resistance. (Take g = 10 m s^(-2) )

The string of a pendulum is 2.0m long. The bob is pulled sideways so that the string becomes horizontal and then the bob is released. What is the speed with which the bob arrives at the lowest point ? Assume theat 10% of initial energy is dissipated against air resistance. Take g=10m//s^(2)

An ice block is projected vertically up with a velocity 20 ms^(-1) . The amount of ice that melt when it reaches the ground and if the loss of P.E. is converted into heat energy if the mass of ice block is 4.2 kg

A particle slides with a speed of 3m s^(-1) at P. When it reaches Q ,it acquires a speed of 4m s^(-1) after describing an angle of 60^(@) at O as shown in figure .Find the changes in the velocity of the particle between P and Q . Assume that the path followed by the particle is circular from P to Q

A simple pendulum of length 1 m, and energy 0.2 J, oscillates with an amplitude 4 cm. When its length is doubled then the energy of oscillation will be

The bob A of a simple pendulum is released from a horizontal position A as shownin in figure. If the length of the pendulum is 1.5m , what is the speed with which the bob arrives at the lowermost point B, given that it dissipates 5% of its initial energy against air resistance ?

A ball is falling freely from a certain height. When it reached 10 m height from the ground its velocity is v_(0) . It collides with the horizontal ground and loses 50 % of its energy and rises back to height of 10 m . The value of velocity v_(0) is

ERRORLESS-SIMPLE HARMONIC MOTION-NCERT BASED QUESTIONS (Simple Pendulum)
  1. There is a simple pendulum hanging from the ceiling of a lift. When th...

    Text Solution

    |

  2. A simple pendulum hanging from the ceiling of a stationary lift has a ...

    Text Solution

    |

  3. A simple pendulum has a hollow sphere containing mercury suspended by ...

    Text Solution

    |

  4. What is the length of a simple pendulum which ticks second?

    Text Solution

    |

  5. if a boby is released into a tunal dug across the diameter of earth, ...

    Text Solution

    |

  6. A simple pendulum is executing simple harmonic motion with a time peri...

    Text Solution

    |

  7. If the length of a pendulum is made 9 times and mass of the bob is mad...

    Text Solution

    |

  8. In case of a simple pendulum, time period versus length is depicted by

    Text Solution

    |

  9. A simple pendulum of length I and mass (bob) m is suspended vertically...

    Text Solution

    |

  10. A clock which keeps correct time at 20^(@)C is subjected to 40^(@)C. I...

    Text Solution

    |

  11. A simple pendulum is set up in a trolley which moves to the right with...

    Text Solution

    |

  12. What is the velocity of the bob of a simple pendulum at its mean posit...

    Text Solution

    |

  13. A simple pendulum with a bob of mass m oscillates from A to C and back...

    Text Solution

    |

  14. A pendulum of length 2 m lift at P . When it reaches Q , it losses 10%...

    Text Solution

    |

  15. A simple pendulum of length l has maximum angular displacement theta ....

    Text Solution

    |

  16. A uniform rod of length 2.0 m is suspended through an end and is set i...

    Text Solution

    |

  17. A disc of radius R and mass M is pivoted at the rim and it set for sma...

    Text Solution

    |

  18. Time period of a simple pendulum of length L is T(1) and time period o...

    Text Solution

    |

  19. A particle executes simple harmonic motion between x=-A and x=+A. The ...

    Text Solution

    |

  20. A simple pendulum is hanging from a peg inserted in a vertical wall. I...

    Text Solution

    |